text: const DRAWING_ITEMS = 'drawingItems'
  const DRAWING_ITEMS_VERSION = '1.0'
  const DRAWING_ITEMS_VERSION_KEY = 'DRAWING_ITEMS_VERSION'
  const DRAWING_ID = 'idGlobal'
  const TREE_NODE_ID = 'treeNodeId'
  const FORM_CONF = 'formConf'
  
  export function getDrawingList() {
    // 加入缓存版本的概念，保证缓存数据与程序匹配
    const version = localStorage.getItem(DRAWING_ITEMS_VERSION_KEY)
    if (version !== DRAWING_ITEMS_VERSION) {
      localStorage.setItem(DRAWING_ITEMS_VERSION_KEY, DRAWING_ITEMS_VERSION)
      saveDrawingList([])
      return null
    }
  
    const str = localStorage.getItem(DRAWING_ITEMS)
    if (str) return JSON.parse(str)
    return null
  }
  
  export function saveDrawingList(list) {
    localStorage.setItem(DRAWING_ITEMS, JSON.stringify(list))
  }
  
  export function getIdGlobal() {
    const str = localStorage.getItem(DRAWING_ID)
    if (str) return parseInt(str, 10)
    return 100
  }
  
  export function saveIdGlobal(id) {
    localStorage.setItem(DRAWING_ID, `${id}`)
  }
  
  export function getTreeNodeId() {
    const str = localStorage.getItem(TREE_NODE_ID)
    if (str) return parseInt(str, 10)
    return 100
  }
  
  export function saveTreeNodeId(id) {
    localStorage.setItem(TREE_NODE_ID, `${id}`)
  }
  
  export function getFormConf() {
    const str = localStorage.getItem(FORM_CONF)
    if (str) return JSON.parse(str)
    return null
  }
  
  export function saveFormConf(obj) {
    localStorage.setItem(FORM_CONF, JSON.stringify(obj))
  }
  